consequent distinction between segments and frames.

Unidirectional transports and connections are now called
simplex rather than batch. Bidirectional transports and connections
are now called duplex rather than stream.

No Thread.sleep() till Brooklyn.

packet.

connection was recognised.

plugin.

This will enable asynchronous access to the database for IO threads.

This ensures the frame number is covered by the MAC, cleanly
separating encryption from authentication (previously we depended on
the encryption layer to garble frames if they were reordered).